#include<bits/stdc++.h>
using namespace std;
inline int read()
{
	int x=0,f=1;char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){x=(x<<3)+(x<<1)+(ch^48);ch=getchar();}
	return x*f;
}
int main()
{
	//freopen     
	//freopen
	//freopen
	//freopen
	//freopen
	//freopen luogu uid 772909
	freopen("arena.in","r",stdin);
	freopen("arena.out","w",stdout);
	return 0;
}
